CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings	$ 6,722	$ 8,898	$ 27,866	$ 47,547
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(3,950)	(8,279)	36	(15,445)
Derivative instruments	1,708	4,199	2,162	4,304
Pension and postretirement plans	(3)	(2)	(10)	(11)
Total other comprehensive income, net of tax	(2,245)	(4,082)	2,188	(11,152)
Total Comprehensive income	4,477	4,816	30,054	36,395
Comprehensive income (loss) attributable to noncontrolling interest, net of tax:
Net earnings	63	52	152	129
Foreign currency translation adjustments	47	(115)	(63)	(176)
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	110	(63)	89	(47)
Comprehensive income attributable to SMP	$ 4,367	$ 4,879	$ 29,965	$ 36,442